This is an old issue that started with SU8 if I´m not wrong. Many airport addons, specially small fields, include a custom AirportServices configuration to disable ground services. As of today (SU11) a wrong configuration of that file produces the following errors in game:
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Gliders takeoff doesn´t work: no ground crew appears holding the wing and neither tow plane nor winch methods are operational. You can´t takeoff therefore, nor in free flight nor in training/activities.
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Marshallers don´t appear
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Complete set of ground services vehicles don´t appear
Those errors are reproduced worldwide on any other airports that don´t include their own AirportServices configuration, as the faulty ones will override the ground services system globally.
The correct configuration shall be something like the following, including the compiled Services.spb file:
<airport addon name>/AirportServices/<ICAO code>/Services.spb
Uncompliled xml/txt files or wrong subfolder setting (using the ICAO code is the best solution) will produce the error. There are some actions needed as this is preventing some game features to work:
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For developers: fix the configuration definition, recompile the addon and reupload it.
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For Asosbo/Third party stores: several airport addons on Marketplace and other stores still contain such errors. They need to be updated so please contact developers, publish an SDK warning notice or correct them directly on the Marketplace or your stores if possible. I have reported some during the past months and they were fixed by authors but others are still faulty (mainly due to uncompiled files):
aerosoft-airfield-egte-exeter (it´s missing the ICAO subfolder)
aerosoft-airport-enmh-mehamn
aerosoft-airport-enov-hovden
aerosoft-airport-enst-stokka
footagedesigns-lecd
footagedesigns-ordis
justflight-airport-kszp-santapaula (it´s missing the ICAO subfolder)
onfinalstudio-enbv
onfinalstudio-ensk
southoak-phdh
southoak-phpa
EGTR Elstree Aerodrome (ORBX)(it has an extra uncompiled file that must be removed)
- For users: manual fixing of files, or eventual removal of the whole AirportServices folder can be required until updating comes. MSLayoutGenerator.exe can be used to update the layout.json files on the addon folder after manual corrections.
I include a couple of old topics where those errors and corrections were discussed:
Cheers